octeon: set 5.4 as default kernel

octeon has provided 5.4 as testing kernel for some time now, let's
switch to 5.4 to have a bigger audience for testing.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/octeon/Makefile

@@ -12,7 +12,7 @@ BOARDNAME:=Cavium Networks Octeon
 FEATURES:=squashfs ramdisk pci usb
 CPU_TYPE:=octeonplus
 
-KERNEL_PATCHVER:=4.19
+KERNEL_PATCHVER:=5.4
 KERNEL_TESTING_PATCHVER:=5.4
 
 define Target/Description